Sorry to hear about your trouble Fordman. As has been stated, it's hard for us to tell you what's wrong. But, rebuilding these types of cylinders is not complicated. Like oldseabee said, the wiper doesn't hold back oil, that's the job of the inner u-cup, the wiper only prevents dirt/contaminents from fouling u-cup from the outside.
This is very simple. First of all, the seals must be the correct size seals, maybe they gave you the wrong seals. If your certain they are correct, take your cylinder apart, all components must be thoroughly cleaned. Inspect inside and outside of gland for scratches, cracks, corrosion pits, etc. Once you have verified gland is in proper working condition, install the new seals by hand or by using a dull ended tool, under no circumstances use sharp tools or pics for installation. And most important, the u-cup must be installed with the "U" side pointing inward. Hope this helps.
